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Technical
Note Interaction of butyl xanthate
with oxidized surface of sphalerite
The rate constants for the reaction of potassium butyl xanthate (PBX) and
copper sulphate with the surface of natural sphalerite have been determined
by the method of spectrophotometry. It is shown that the decrease of the
reaction rate has been caused by blocking the mineral surface by the
reaction products which resulted in decreasing the amount of the formed
dixanthogen and flotation activity of sphalerite. The rate of oxidizing
decomposition of xanthate-anion on the oxidized sphalerite surface does not
depend on the presence of elementary sulphur on it and increases in presence
of active surface copper cations. Elementary sulfur forms on the oxidized
surface of sphalerite represented as separate phases and is not an inert
substance in respect to flotation reagents due to the formation of steady
matter of the type of copper sulphides CuSn (n ³ 1),
which was not active in respect to xanthates. |
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